Final HP

by jared76 Thu Aug 11, 2011 1:28 am

Im in the middle of working on my mali and i want a ballpark guess on my final Horsepower.

L98 heads light P&P
Perfromer + Cam
Dual plane intake
650 Holley

Thanks

by TWBouska AKA Wooderson Thu Aug 11, 2011 1:54 am

Your leaving out 2 keys to the puzzle there...#1 what size cam, #2 what size engine.

by jared76 Thu Aug 11, 2011 2:13 am

TWBouska AKA Wooderson wrote:Your leaving out 2 keys to the puzzle there...#1 what size cam, #2 what size engine.

Sorry bout that...
350 and....

270/268 dur
420/442 lift

by ant7377 Thu Aug 11, 2011 7:20 am

300-350

by The Dude Thu Aug 11, 2011 12:59 pm

Also compression & exhaust makes a big difference. Could easily be looking at 200hp or 350hp with the components that you listed. Too many variables IMHO & the two parts that I mentioned are gonna be a huge influence on power production.

by jared76 Thu Aug 11, 2011 1:00 pm

ant7377 wrote:300-350

thats what i was shooting for

Thanks

by jared76 Thu Aug 11, 2011 1:03 pm

Rago wrote:Also compression & exhaust makes a big difference. Could easily be looking at 200hp or 350hp with the components that you listed. Too many variables IMHO & the two parts that I mentioned are gonna be a huge influence on power production.

I figured that i would end up with 9.5:1 comp and i have no idea what kind of headders i am getting. Whats the best fit for our cars?

thanks

by Limey SE Thu Aug 11, 2011 1:57 pm

jared76 wrote:
Rago wrote:Also compression & exhaust makes a big difference. Could easily be looking at 200hp or 350hp with the components that you listed. Too many variables IMHO & the two parts that I mentioned are gonna be a huge influence on power production.

I figured that i would end up with 9.5:1 comp and i have no idea what kind of headders i am getting. Whats the best fit for our cars?

thanks

LONG TUBES FTW

by oldstofty Thu Aug 11, 2011 2:20 pm

I run a Big Block Olds so its completely different but for whats its worth I played hell when i stepped up to 1 7/8 inch headers. The Pass side has once tube that goes over the frame and I also had to unbolt the motor mount and jack the motor up about 2 inches. IMO stay at 1 3/4 or smaller and judging by ur combo you shouldnt need anything larger.

by jared76 Thu Aug 11, 2011 6:08 pm

oldstofty wrote:I run a Big Block Olds so its completely different but for whats its worth I played hell when i stepped up to 1 7/8 inch headers. The Pass side has once tube that goes over the frame and I also had to unbolt the motor mount and jack the motor up about 2 inches. IMO stay at 1 3/4 or smaller and judging by ur combo you shouldnt need anything larger.

where should i pick up a pair of 1 1/2 or 1 3/4 ones ?

by TWBouska AKA Wooderson Thu Aug 11, 2011 7:38 pm

pick them up through summit or jegs, you might be able to get a better deal off craigslist, but people are flakes and lie and sell you junk a lot of the time, not worth the savings in money in my opinion.

by jared76 Thu Aug 11, 2011 10:52 pm

TWBouska AKA Wooderson wrote:pick them up through summit or jegs, you might be able to get a better deal off craigslist, but people are flakes and lie and sell you junk a lot of the time, not worth the savings in money in my opinion.

What brand will work with the least amount of "massaging"???

thanks

by ant7377 Fri Aug 12, 2011 12:20 am

I use Dynomax,they fit very well but the number 6 header tube is close to the plug.Test fit and dent it a bit to get a little more clearance.

by Limey SE Fri Aug 12, 2011 12:23 am

Blackjacks on first BU ............eh ok

this one guy swears they were hookers but no plate on the headers I wanna say more to Hedmans that I have and so far no clearance issue but will let you know when I get the engine harness here

by abajc3 Fri Aug 12, 2011 4:06 am

i have headman long tubes and its a pain to get 2 or 3 plugs out. puts me in a bad mood everytime i have to get them out

by Limey SE Fri Aug 12, 2011 5:02 am

Limey wrote:Blackjacks on first BU ............eh ok

this one guy swears they were hookers but no plate on the headers I wanna say more to Hedmans that I have and so far no clearance issue but will let you know when I get the engine harness here

These are mine

Final HP A5177f25

by TWBouska AKA Wooderson Fri Aug 12, 2011 5:17 am

jared76 wrote:
TWBouska AKA Wooderson wrote:pick them up through summit or jegs, you might be able to get a better deal off craigslist, but people are flakes and lie and sell you junk a lot of the time, not worth the savings in money in my opinion.

What brand will work with the least amount of "massaging"???

thanks

all of the ones the guys mentioned so far are good, doug thorleys or sandersons are probably the best, but you'll pay through the nose. I have hedman shortys ceramic coated on my el camino cause its my daily, the 70' chevelle has the original motor right now but its getting the 454 with the stainless steel doug thorleys. what bacj is saying about the hedmans is right, the 5/6 cylinder plugs are a BITCH to get out, but i got them cause they were $100 and ceramic coated BRAND NEW. cant beat that.

by oldstofty Fri Aug 12, 2011 8:14 am

I ran hedmans first the switched to Hooker Super Comps and the difference in quality is obvious. The Hookers flange is very nice and smooth, where as the Hedman flange was pretty rough, I also had a problem with the Hedmans eating gaskets

by The Dude Fri Aug 12, 2011 10:16 am

by 74Malibu383 Fri Aug 12, 2011 10:44 am

I had Headman headers on my car before. They fit ok, but not great. Two of the plugs required heat shields on the wires and they hung down too low. I switched to Hooker Super Comps and have none of the above issues. Yes, they are pricey, but you get what you pay for.

by The Dude Fri Aug 12, 2011 12:49 pm

I think the picture I posted above should tell you where I stand. I've ran two different sets on mine. The first set fit great & plugs weren't that big of a hassle. http://www.summitracing.com/parts/HOK-2451HKR/

My latest set required some massaging on the passenger side due to interference problems with the frame. http://www.summitracing.com/parts/HOK-2116-1HKR/

EVERY set of headers that you put on will require taking out the "crash bars" underneath your car. Not sure of the exact term for these, but they are useless IMO & just add weight to the front end.

Here's a good read on sizing though:
http://www.chevyhiperformance.com/techarticles/148_0404_best_headers_shootout/index.html

by oldstofty Fri Aug 12, 2011 1:07 pm

I had to heat mine up and bend one tube on a press to clear the oil filter housing, but other than that just time consuming, not something you wanna do alot

by JB2wheeler Fri Aug 12, 2011 1:16 pm

When I was looking for headers I researched and found out that cheap Hedmans were no good, but the Hedman Elite series were great. I went to buy them and the shop did not have them in stock, but did have the Comps, so I bought them. They are nice, but I cant do anything without them dragging unless on perfectly level ground. JB

by TWBouska AKA Wooderson Fri Aug 12, 2011 4:14 pm

74Malibu383 wrote:I had Headman headers on my car before. They fit ok, but not great. Two of the plugs required heat shields on the wires and they hung down too low. I switched to Hooker Super Comps and have none of the above issues. Yes, they are pricey, but you get what you pay for.

i have to run the heat shields and the shorter ACCEL plugs on my car too for get them to clear the #5/6 cylinders also, so i hear you on that.

by oldstofty Fri Aug 12, 2011 4:50 pm

My dads 468 BBC has aluminum 2 inch headers and every spark plug boot is covered with a Thermo-Tec soft heat sheid.

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