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May 3rd, 2007, 05:12 PM
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4.1 "291" Block and "515" Casting Cyl Heads
I have a "291" 4.1 liter short block and "515" casting cyl heads. What have other TTA owners used as head bolts to correctly fasten the cylinder heads to the short block? It seems that the crux of the dilema is fastening 3.0 liter cyl heads to the 4.1 block requires a special or custom head bolt.
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1989 Turbo Trans Am #178, "291" 4.1 with ported irons and intake, rollerized valve train, 210/215 roller cam, PTS 9/11 3200 T/C, CPT66 BB, stock IC with Duttwieller neck in the works. Previous combo: 11.79 @ 114.7 w/1.61 60' all time best with TA49. ATR bleed valve to control boost, Ext Chip - 23/19 timing, Translator Plus, LT1 MAF Sensor, 62mm T/B, ported plenum, 1" plenum spacer, 60# MotoTron injectors, Adj F/P reg, Walbro 340 F/P, Action Fab 3” D/P, freeflowing exhaust with testpipe, 110# valve springs, PTS 9/11 Lock-up 2800 T/C, BFG Drag Radials on stock rims, Spohn Adjustable Torque Arm, Global West Subframe Connectors, Spohn Adj Panhard Rod, Spohn Lower Control Arms     
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May 4th, 2007, 12:16 PM
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Last I remembered u need two sets of GN ARPies to make one TTA set.
As far as headbolts go at least:-) No one makes a TTA specific headbolt set. Maybe try dealer for stock bolt set? later Jeremy
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May 4th, 2007, 12:28 PM
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The solution at hand to mate the 515 heads to the 291 block was to place a special order from ARP:
4 bolts 4.0" long 4 bolts 2.875" long 8 bolts 2.0" long Cost $59.75 plus shipping. It appears that the 291 block has the threads recessed approximately 3/4" into the block. When we started this engine project...never anticipated the issues that have cropped up...live and learn. Mark
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1989 Turbo Trans Am #178, "291" 4.1 with ported irons and intake, rollerized valve train, 210/215 roller cam, PTS 9/11 3200 T/C, CPT66 BB, stock IC with Duttwieller neck in the works. Previous combo: 11.79 @ 114.7 w/1.61 60' all time best with TA49. ATR bleed valve to control boost, Ext Chip - 23/19 timing, Translator Plus, LT1 MAF Sensor, 62mm T/B, ported plenum, 1" plenum spacer, 60# MotoTron injectors, Adj F/P reg, Walbro 340 F/P, Action Fab 3” D/P, freeflowing exhaust with testpipe, 110# valve springs, PTS 9/11 Lock-up 2800 T/C, BFG Drag Radials on stock rims, Spohn Adjustable Torque Arm, Global West Subframe Connectors, Spohn Adj Panhard Rod, Spohn Lower Control Arms
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May 5th, 2007, 08:09 AM
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The bolts dont go through like on the 109 block.
Thanks for the heads up on the lengths. Julio
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89 TTA Stock appearing  10.550 at 132.22 1.539 60ft 3850 race weight w/driver Always on 93 octane www.alkycontrol.com 727-570-9999 http://stores.ebay.com/ALKYCONTROL_W...eNameZl2QQtZkm
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May 6th, 2007, 09:29 AM
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Figured that I might as well pass on what I learned.
Mark
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1989 Turbo Trans Am #178, "291" 4.1 with ported irons and intake, rollerized valve train, 210/215 roller cam, PTS 9/11 3200 T/C, CPT66 BB, stock IC with Duttwieller neck in the works. Previous combo: 11.79 @ 114.7 w/1.61 60' all time best with TA49. ATR bleed valve to control boost, Ext Chip - 23/19 timing, Translator Plus, LT1 MAF Sensor, 62mm T/B, ported plenum, 1" plenum spacer, 60# MotoTron injectors, Adj F/P reg, Walbro 340 F/P, Action Fab 3” D/P, freeflowing exhaust with testpipe, 110# valve springs, PTS 9/11 Lock-up 2800 T/C, BFG Drag Radials on stock rims, Spohn Adjustable Torque Arm, Global West Subframe Connectors, Spohn Adj Panhard Rod, Spohn Lower Control Arms
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