642 heads
02-25-2005, 09:15 AM
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Car: 1991 camaro RS
Engine: 305 Carb
Transmission: 700R4
642 heads
Would a 642 head be good for my 305 with a carb, LT1 cam and intake manifold swap?
02-25-2005, 04:42 PM
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Car: 4
Engine: 6
Transmission: 5
No.
And a pair would be twice as bad as just one.
In fact, it's one of the worst possible choices there is.... a 76cc chamber smogger.
Your compression would be unbelievably low. My calculator says 7.7:1.
The motor would make just barely more power than the amount it consumes internally. If you did nothing else to your TBI motor except swap to those heads, they'd probably cost you 40-50 HP off of whatever it makes now.
And a pair would be twice as bad as just one.
In fact, it's one of the worst possible choices there is.... a 76cc chamber smogger.
Your compression would be unbelievably low. My calculator says 7.7:1.
The motor would make just barely more power than the amount it consumes internally. If you did nothing else to your TBI motor except swap to those heads, they'd probably cost you 40-50 HP off of whatever it makes now.
02-25-2005, 09:00 PM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Might make sense if you were going to run the engine on Kerosene. LOL.
There are much better head choices out there for only a few more bucks.
There are much better head choices out there for only a few more bucks.
02-27-2005, 05:43 PM
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Car: 1991 camaro RS
Engine: 305 Carb
Transmission: 700R4
Ok, i was thinking that might have been the bad ones. Well, im thinking that i might stick with my stock heads for now, would it be worth it to go ahead and get the ported and polished?
02-27-2005, 05:52 PM
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General Question??
i was wondering what kinda of hp and compression i will end up with if i get my heads ported and shaved to the almost their limits.(they are l26's)its a tappet motor with mild cam but will be gettin one with almost .510 and it is a '75 4boltmain bored .060 over with a 750holley Double pumper.Im just want a close estimate????????????????
02-27-2005, 11:37 PM
#6
Re: General Question??
Originally posted by 89blackm
i was wondering what kinda of hp and compression i will end up with if i get my heads ported and shaved to the almost their limits.(they are l26's)its a tappet motor with mild cam but will be gettin one with almost .510 and it is a '75 4boltmain bored .060 over with a 750holley Double pumper.Im just want a close estimate????????????????
i was wondering what kinda of hp and compression i will end up with if i get my heads ported and shaved to the almost their limits.(they are l26's)its a tappet motor with mild cam but will be gettin one with almost .510 and it is a '75 4boltmain bored .060 over with a 750holley Double pumper.Im just want a close estimate????????????????
seriously dude, i don't think i have ever seen a more vague spec sheet for an engine. what cubic inch, what head, what are the specs for the cam, what intake, what exhaust, what stall for the tranny, what rear gear.
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