bolt adapters on HSR & stock heads (center bolts)
Thread Starter
Senior Member
Joined: Jan 2002
Posts: 600
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From: orlando
Car: 98 Camaro SS
Engine: LS1
Transmission: M6
bolt adapters on HSR & stock heads (center bolts)
Holley PN 90748 is $55.
is there an AFFORDABLE solution to this?
I've heard about wallowing out the holes.. Any pics?
Supreme Member
Joined: Oct 2001
Posts: 1,392
Likes: 4
From: orlando, fl usa
Car: 1986 pontiac TA
Engine: 360 HSR
Transmission: 700r4 3300 yank converter
Axle/Gears: 3.27 9 bolt
holes are already wallowed out. can take some stock tubing and angel cut it to match the 72* angle. then leave flat on other side.
Senior Member
Joined: Jul 1999
Posts: 784
Likes: 0
From: Sacramento, CA
Car: 89 Iroc
Engine: 383
Transmission: 700R4
Axle/Gears: 3.45
Even with the holes enlarged the intake won't sit flush with the heads. You'll need to have the intake milled to match the same angle as the heads. You probably have a gap right now between the intake and the block large enough for you to almost see in to the lifter valley from the front.
Supreme Member
Joined: Oct 2001
Posts: 1,392
Likes: 4
From: orlando, fl usa
Car: 1986 pontiac TA
Engine: 360 HSR
Transmission: 700r4 3300 yank converter
Axle/Gears: 3.27 9 bolt
danny - it's just the four center ones. because of the 72* angle of the bolt holes. 87-up iron heads. intake sits flush with heads.
Senior Member
Joined: Jul 1999
Posts: 784
Likes: 0
From: Sacramento, CA
Car: 89 Iroc
Engine: 383
Transmission: 700R4
Axle/Gears: 3.45
Oh only the center bolts? Never mind. 
Sorry, I had an intake problem with the outer bolts. Turns out that the heads that I bought had been milled and I didn't know.
Sorry, I had an intake problem with the outer bolts. Turns out that the heads that I bought had been milled and I didn't know.
Supreme Member
Joined: Sep 2000
Posts: 1,398
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From: USA
Thread Starter
Senior Member
Joined: Jan 2002
Posts: 600
Likes: 0
From: orlando
Car: 98 Camaro SS
Engine: LS1
Transmission: M6
awesome, found the bolts @ mcmaster.com
need a few measurements if anyone has them:
bolt diameter, lower wedge height, upper wedge height..
need a few measurements if anyone has them:
bolt diameter, lower wedge height, upper wedge height..
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