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by F-BIRD'88
Mon Apr 19, 2021 6:47 pm
Forum: Engine Tech
Topic: IMPORT High Performance OEM Type Hydraulic Roller Lifters
Replies: 5
Views: 167

Re: IMPORT High Performance OEM Type Hydraulic Roller Lifters

For this purpose a simple a-b leak time test VS a known good oem lifter would tell the tale. Its either a good functional hyd roller lifter or its not.
by F-BIRD'88
Mon Apr 19, 2021 6:03 pm
Forum: Engine Tech
Topic: IMPORT High Performance OEM Type Hydraulic Roller Lifters
Replies: 5
Views: 167

Re: IMPORT High Performance OEM Type Hydraulic Roller Lifters

Should have measured the leakdown rate or at least rough compared to a stock gm lifter..
All full skirt style oem type hyd roller liftrrs have a .700" wheel.
.750" with full skirt do not exist..
Does this lifter allow swapping the wire clip for a C clip?
by F-BIRD'88
Mon Apr 19, 2021 4:27 pm
Forum: Engine Tech
Topic: camshaft specs for 79 Corvette L82
Replies: 12
Views: 563

Re: camshaft specs for 79 Corvette L82

GM and most aftermarket replacements list the SAE seat duration @.006" valve. 291-287 or 292-288.

.006" @the valve (SAE) is .004" at the lifter.

but .006" @ the lifter (Comp etc) will be sbout +/- 7-8 ° LESS
by F-BIRD'88
Sat Apr 17, 2021 11:09 pm
Forum: Engine Tech
Topic: overheating question
Replies: 46
Views: 702

Re: overheating question

On this old sbc intake the rear water port bosses are there but not drilled and tapped. Improved cooling if you finish the job.
https://i.ebayimg.com/images/g/~GoAAOSw ... s-l400.jpg
by F-BIRD'88
Sat Apr 17, 2021 10:33 pm
Forum: Engine Tech
Topic: overheating question
Replies: 46
Views: 702

Re: overheating question

The origional design had the bypass/heater hose going to the back of the intake near the diz not to the front near the thermostat. Moving the heater hose to available rear water ports on the intake corrects this.. The engine idles cooler. The cooling system works better. I don't recall any SBC gett...
by F-BIRD'88
Sat Apr 17, 2021 8:06 pm
Forum: Engine Tech
Topic: overheating question
Replies: 46
Views: 702

Re: overheating question

Short of simple locked out timing you need to create a idle/off idle timing control circuit that will trigger the ECU to add timing when at idle and small throttle openings (throttle position sensor or switch.+ MAP sensor (vacuum sensor) This can simulate the function of old school idle/off idle) "v...
by F-BIRD'88
Sat Apr 17, 2021 7:57 pm
Forum: Engine Tech
Topic: overheating question
Replies: 46
Views: 702

Re: overheating question

No vacuum advance and only 18 initial... Thats ½ your problem. Try 26 base initial.. With your big cam try locked timing 34-36 at idle. (The cammed up motor actually wants MORE AT IDLE). If your intake manifold has the extra water ports at the rear near the distributor connect the drivers side rear ...
by F-BIRD'88
Sat Apr 17, 2021 7:04 pm
Forum: Engine Tech
Topic: 416 heads vs iron l98 tpi heads
Replies: 9
Views: 406

Re: 416 heads vs iron l98 tpi heads

Can't beat that Eddy Tunnel Ram. The HP and car performance gain is impressive. Note: on all these sbc heads 083, 081, 4416, 601 castings When setting up the valvespring installed height that the exhaust spring seats are a lot deeper. A .105" stack of spring seat shims corrects this difference (.060...
by F-BIRD'88
Fri Apr 16, 2021 2:30 pm
Forum: Engine Tech
Topic: camshaft specs for 79 Corvette L82
Replies: 12
Views: 563

Re: camshaft specs for 79 Corvette L82

You can pick up a lot of low mid if you advance this cam by 8 degrees from 115/113 centers to 107/121 centers (114LSA) when in engines with a lower compression ratio. You trade off a small amount of peak horsepoeer for a good bit of low end torque where most mild stuff needs it. A new intake C/L of ...
by F-BIRD'88
Fri Apr 16, 2021 7:05 am
Forum: Engine Tech
Topic: camshaft specs for 79 Corvette L82
Replies: 12
Views: 563

Re: camshaft specs for 79 Corvette L82

Any normal sbc hyd lifter Ht817 (sealed power speed pro)
by F-BIRD'88
Fri Apr 16, 2021 5:03 am
Forum: Engine Tech
Topic: camshaft specs for 79 Corvette L82
Replies: 12
Views: 563

Re: camshaft specs for 79 Corvette L82

222/222 @.050" .450"/.460" lift 115/113 centers 114 LSA

A lot of aftermarket replacements list it as 224/224 @.050"
You can still buy this cam from GMPP 3896962
by F-BIRD'88
Thu Apr 15, 2021 1:57 pm
Forum: Engine Tech
Topic: 416 heads vs iron l98 tpi heads
Replies: 9
Views: 406

Re: 416 heads vs iron l98 tpi heads

Proof is in the pudding.
http://www.hotrodders.com/forum/attachm ... 1227570680

#4416 heads 1.94/1.60 full DIY Poor man's racer Port and prep.
by F-BIRD'88
Thu Apr 15, 2021 12:02 pm
Forum: Engine Tech
Topic: 416 heads vs iron l98 tpi heads
Replies: 9
Views: 406

Re: 416 heads vs iron l98 tpi heads

The port volume of the 4416 head is bigger than a vortec port... The as cast MCSA is smaller, you're going to fix that. A bowl port is not enough you need a serious DIY full port effort.. You don't need a flow bench. Finished port volume 178cc (1.94" valve) Vortecs flow 228 cfm stock as cast. You wi...
by F-BIRD'88
Thu Apr 15, 2021 2:46 am
Forum: Engine Tech
Topic: 416 heads vs iron l98 tpi heads
Replies: 9
Views: 406

Re: 416 heads vs iron l98 tpi heads

Make sure the finished chamber volume is right for the compression ratio of your 350 sbc that your fuel octane allows. The 083 L98 heads in final form are all the same job, same money cost but should make a bit more power.
by F-BIRD'88
Thu Apr 15, 2021 2:04 am
Forum: Engine Tech
Topic: 416 heads vs iron l98 tpi heads
Replies: 9
Views: 406

Re: 416 heads vs iron l98 tpi heads

Yes and yes you can.. Needs generous porting.. Bigger valves help too. eg, 1.94/1.60 2.02/1.60 Blocking the twinned egr heat riser passages helps. The 083 L98/ Tpi heads have slightly more potential with equal valves and prep. Not as good as vortec heads. Not as good as the good camel back, fuelie h...