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Search found 804 matches

by PRH
Sat Jul 04, 2020 10:31 am
Forum: Engine Tech
Topic: 302 Clevo 2V Heads with undersized valve guides
Replies: 10
Views: 372

Re: 302 Clevo 2V Heads with undersized valve guides

Just boil it down to the basics, and you’ll likely find the correct answer. Do you think you can find performance build quality single groove valve locks that will provide adequate clamping pressure on some .336 stem valves(if you could even find .336 valves)? The easiest path forward(although, prob...
by PRH
Fri Jul 03, 2020 1:59 pm
Forum: Engine Tech
Topic: Used Cam
Replies: 17
Views: 945

Re: Used Cam

If you want to buy the lifters from us, you can send me the cam, and I'll parkerize it for free.
Can’t beat that deal!!
by PRH
Sun Jun 21, 2020 10:31 am
Forum: Engine Tech
Topic: Early prostock iron heads.
Replies: 41
Views: 2518

Re: Early prostock iron heads.

I wonder what those vanes were worth on the bench......and the dyno.
by PRH
Wed Jun 17, 2020 7:43 pm
Forum: Engine Tech
Topic: sbc heads Jeg's Canfield 215 sold new in 2004
Replies: 5
Views: 489

Re: sbc heads Jeg's Canfield 215 sold new in 2004

I had a couple of sets of those Jegs heads come thru the shop when they were current. They didn’t require offset rockers, but other than that I don’t recall too much about them....... other than they didn’t stand out to me as anything special. I was like “meh”. But I can’t say for sure if they were ...
by PRH
Tue Jun 16, 2020 3:48 pm
Forum: Engine Tech
Topic: Carb too small?
Replies: 23
Views: 965

Re: Carb too small?

An easy test to see if the carb is on the small side for the application is put gauge on it and read the manifold vacuum at wot/high rpm. I don’t think that motor would even pull 1.5” at 5K with a 650cfm carb on it. If it’s not pulling over 1.5”, I wouldn’t be thinking it was “too small”....... or t...
by PRH
Sat Jun 13, 2020 1:44 pm
Forum: Engine Tech
Topic: NHRA STOCK valve job
Replies: 27
Views: 1630

Re: NHRA STOCK valve job

When I originally did the heads for his car there were still a lot of rules pertaining what could and couldn’t be done with the valve job. All of the original dyno testing was done with the heads done that way, and many cams had been tried through the years. The car is in a pretty good place right n...
by PRH
Fri Jun 12, 2020 10:14 am
Forum: Engine Tech
Topic: NHRA STOCK valve job
Replies: 27
Views: 1630

Re: NHRA STOCK valve job

When I saw the rules had all the wording involving seat angles and max top above OD, etc, removed from that section my first thought was, “they don’t want to bother checking it anymore”. In my mind the wording was clear. Take it at face value...... any valve job permitted. Yet, I’d still read things...
by PRH
Thu Jun 11, 2020 4:37 pm
Forum: Engine Tech
Topic: W2 mopar
Replies: 5
Views: 288

Re: W2 mopar

After removing and reinstalling?

Why would they need to be removed anyway?
by PRH
Thu Jun 11, 2020 11:36 am
Forum: Engine Tech
Topic: W2 mopar
Replies: 5
Views: 288

Re: W2 mopar

That looks like a bit of a cluster f&@k situation.

I can’t imagine having those inserts removed is going to improve the odds of them not leaking in the future.
by PRH
Thu Jun 11, 2020 9:52 am
Forum: Engine Tech
Topic: NHRA STOCK valve job
Replies: 27
Views: 1630

Re: NHRA STOCK valve job

They don't have time to check valve seat angles.
Whether they have time to or not...... with the way the rule currently reads...... why would they? And what would they even look for/look at?


The entire description of the valve job is “any valve job permitted”.
That’s pretty cut and dried to me.
by PRH
Tue Jun 09, 2020 10:38 am
Forum: Engine Tech
Topic: NHRA STOCK valve job
Replies: 27
Views: 1630

Re: NHRA STOCK valve job

There are certain things that even though they are deemed illegal, they never bother checking in tear-down ... One is valve seating angle as long as the entire valve job width meets the rule. The thing is...... there is no more rule. As written, the rule states, “any valve job permitted”. From what...
by PRH
Mon Jun 08, 2020 5:31 pm
Forum: Engine Tech
Topic: NHRA STOCK valve job
Replies: 27
Views: 1630

Re: NHRA STOCK valve job

I’m not a member over on CR, but the topic had been brought up when the rule changed, with what looked like a fair amount of confusion within some of the answers. Like I said, my interpretation was that any angles were legal...... and that the NHRA simply wanted to get away from having to check/poli...
by PRH
Mon Jun 08, 2020 4:58 pm
Forum: Engine Tech
Topic: NHRA STOCK valve job
Replies: 27
Views: 1630

Re: NHRA STOCK valve job

I’m having an argument on another forum about what is and isn’t legal with regards to the valve job itself. My interpretation of “any valve job permitted” is anything goes. In 2007 or 2008 they removed any wording about seat angles. Their argument is the stock seat angle must be retained. That isn’t...
by PRH
Mon Jun 08, 2020 4:36 pm
Forum: Engine Tech
Topic: NHRA STOCK valve job
Replies: 27
Views: 1630

NHRA STOCK valve job

How do you interpret what’s legal in Stock for a valve job these days? I’m sure Chad has the answer as far as NHRA is concerned. SECTION 11A: STOCK, ENGINE: 1, CYLINDER HEADS (Page 3) Must be correct casting number for year and horsepower claimed, per NHRA Technical Bulletins or NHRA accepted. Porti...
by PRH
Sat Jun 06, 2020 7:07 pm
Forum: Engine Tech
Topic: Tuning with an A/F gauge
Replies: 31
Views: 1174

Re: Tuning with an A/F gauge

When I get a carb set up so the idle is strong, and the tip in response is nice and sharp...... the A/F gauge isn’t ever reading mid-14’s at idle. Mid-high 13’s is more the norm........ with lumpier cams being a bit richer still. I’m not worried about getting every last .1 mpg out of these things. I...