FLAT TAPPET TO ROLLER ???
04-15-2011, 11:38 PM
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Car: 91 R/S , 89 dodge p/u
Engine: L31 GM crate re-cammed , 318
Transmission: T-5 , 4 speed auto
Axle/Gears: 3.42 , ?
FLAT TAPPET TO ROLLER ???
O.K. , to all you engine GURUS's . i was in a discussion about GMPP crate eng. #19210007 . it has a flat tappet cam shaft .435int./.460ex. lift , 212int/222ex duration . question is can one just swap swap to roller lifters by just swapping lifters ? we realize not stock factory lifters . but can/should it be done ??? thanks ...
04-16-2011, 05:10 AM
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Car: 1987 Monte Carlo SS
Engine: 305
Transmission: 200R4
Axle/Gears: 3.73
Re: FLAT TAPPET TO ROLLER ???
If the block was not designed to use a roller cam then you need those retro roller lifters and the lock plate to hold the cam back.
Those lifter sets alone run from $289 for Howard ones to $400 ish for Comp cams ones, plus the cams run $100+ more on average. Your looking at $500 at least for new parts.
I was hoping once I pulled the motor for rebuild in a couple of years, since its a 87 with a flat tappet cam in it, it was designed for a roller cam, just not finish machined.
I can ebay all the stuff needed including a used cam for less than $200. $300 extra to me for a minor gain IMO is pushing it cost effective wise.
Those lifter sets alone run from $289 for Howard ones to $400 ish for Comp cams ones, plus the cams run $100+ more on average. Your looking at $500 at least for new parts.
I was hoping once I pulled the motor for rebuild in a couple of years, since its a 87 with a flat tappet cam in it, it was designed for a roller cam, just not finish machined.
I can ebay all the stuff needed including a used cam for less than $200. $300 extra to me for a minor gain IMO is pushing it cost effective wise.
04-16-2011, 07:51 AM
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Car: 1987 Camaro Z28
Engine: 355ci, XE262 , 650dp
Transmission: T-5, RAM clutch
Axle/Gears: 3.23 limited slip
Re: FLAT TAPPET TO ROLLER ???
O.K. , to all you engine GURUS's . i was in a discussion about GMPP crate eng. #19210007 . it has a flat tappet cam shaft .435int./.460ex. lift , 212int/222ex duration . question is can one just swap swap to roller lifters by just swapping lifters ? we realize not stock factory lifters . but can/should it be done ??? thanks ...
04-16-2011, 08:29 PM
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Car: 1990 Iroc
Engine: 6.0
Transmission: 4l65E
Axle/Gears: 373 zexel torsen
Re: FLAT TAPPET TO ROLLER ???
Tom, does this block have the bosses for the spider bracket that holds the roller lifter dog bones in position?
04-16-2011, 09:55 PM
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Car: 91 R/S , 89 dodge p/u
Engine: L31 GM crate re-cammed , 318
Transmission: T-5 , 4 speed auto
Axle/Gears: 3.42 , ?
Re: FLAT TAPPET TO ROLLER ???
i really don't know , it's a GMPP crate eng. that i'm considering . it's in the latest JEGS book page 21-s top center . also in GMPP parts catalog for this year . i think it may but not sure . thanks . ( next time you come down to the coast check in with Gulf Coast 3rd Gens )
04-17-2011, 07:35 PM
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Car: 1990 Iroc
Engine: 6.0
Transmission: 4l65E
Axle/Gears: 373 zexel torsen
Re: FLAT TAPPET TO ROLLER ???
i really don't know , it's a GMPP crate eng. that i'm considering . it's in the latest JEGS book page 21-s top center . also in GMPP parts catalog for this year . i think it may but not sure . thanks . ( next time you come down to the coast check in with Gulf Coast 3rd Gens )
04-17-2011, 08:36 PM
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Car: 91 R/S , 89 dodge p/u
Engine: L31 GM crate re-cammed , 318
Transmission: T-5 , 4 speed auto
Axle/Gears: 3.42 , ?
Re: FLAT TAPPET TO ROLLER ???
i find it hard to believe that no one knows much about this engine . oh well , i'll keep searching . thanks for the replies .
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04-17-2011, 10:33 PM
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Car: 1982 trans am
Engine: 350
Transmission: 4 speed
Axle/Gears: 3.08
Re: FLAT TAPPET TO ROLLER ???
im not to keen on this, but if it does have the bosses for the spider and its not tapped yet, does that mean i could tap it and use a roller cam?
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