a question or two
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Joined: Jul 2000
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
a question or two
i'm looking at a Summit 350 rebuild kit.............
it says that compression will be approx. 9.72:1 with 64 CC heads
i have a set of cast iron 58CC heads
will the compression be too much for the street/ pump gas?
it says that compression will be approx. 9.72:1 with 64 CC heads
i have a set of cast iron 58CC heads
will the compression be too much for the street/ pump gas?
Supreme Member
Joined: Apr 2001
Posts: 4,969
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From: USA
Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
All else being equal, going from 64cc heads to 58cc will raise the comp ratio from 9.72 to 10.4:1.
That's pushing it on an iron head motor. Your cooling system will have to be in 100% condition, and it also depends on what cam you're going to use, as well as the timing curve.
Are you going to use a mech. adv. dist. or CC? What cam are you going with?
AJ
That's pushing it on an iron head motor. Your cooling system will have to be in 100% condition, and it also depends on what cam you're going to use, as well as the timing curve.
Are you going to use a mech. adv. dist. or CC? What cam are you going with?
AJ
Thread Starter
Supreme Member
Joined: Jul 2000
Posts: 4,541
Likes: 2
Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
Originally posted by AJ_92RS
All else being equal, going from 64cc heads to 58cc will raise the comp ratio from 9.72 to 10.4:1.
That's pushing it on an iron head motor. Your cooling system will have to be in 100% condition, and it also depends on what cam you're going to use, as well as the timing curve.
Are you going to use a mech. adv. dist. or CC? What cam are you going with?
AJ
All else being equal, going from 64cc heads to 58cc will raise the comp ratio from 9.72 to 10.4:1.
That's pushing it on an iron head motor. Your cooling system will have to be in 100% condition, and it also depends on what cam you're going to use, as well as the timing curve.
Are you going to use a mech. adv. dist. or CC? What cam are you going with?
AJ
Supreme Member
Joined: Apr 2001
Posts: 4,969
Likes: 0
From: USA
Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Originally posted by 1991tealRSt-topGuy
i guess i should go with the thickest head gaskets i can find, huh?
i guess i should go with the thickest head gaskets i can find, huh?
AJ
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From: Greenville S.C.
Car: 87 Grand National
Engine: 3.8 SFI Turbo
Transmission: BRF 200R4
1991,
Shouldn't be too big a deal. If you want a lot of insurance then polish the combustion chambers. Not only will this increase the cc but will get rid of heat risers which cause predet. this will allow you to use 92 with pretty much whatever initial adv. you choose. So pick up that diegrinder
.
Shouldn't be too big a deal. If you want a lot of insurance then polish the combustion chambers. Not only will this increase the cc but will get rid of heat risers which cause predet. this will allow you to use 92 with pretty much whatever initial adv. you choose. So pick up that diegrinder
. 
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