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Search found 210 matches

by 6.50camaro
Sat Mar 28, 2020 2:35 pm
Forum: Engine Tech
Topic: Bigger intake smaller exhaust valves
Replies: 38
Views: 1740

Re: Bigger intake smaller exhaust valves

By the numbers if the valve guides are at std. sbc dimension of 1.860" ctc then you can fit a 2.125 int and a 1.55 exhaust valve with .0225" between the valves . If the ctc of the guides is 1.890 like Dart uses you can fit 2.150 int with the same 1.55 ex . with .040" between the valves . Thats not c...
by 6.50camaro
Tue Mar 24, 2020 3:48 pm
Forum: Engine Tech
Topic: Lash caps thickness
Replies: 8
Views: 576

Re: Lash caps thickness

Far from a professional just a shade tree guy myself. Stumbled across this a couple years ago trying to find out why Manley exhaust valves length dimensions were longer than intakes and other manufacturers were the same length . Dan
by 6.50camaro
Tue Mar 24, 2020 7:47 am
Forum: Engine Tech
Topic: Lash caps thickness
Replies: 8
Views: 576

Re: Lash caps thickness

If you check manley specs their + .200 ex valve is 5.165 if I remeber correct and the extra lenght is in the margin of the valves . .050 or .060 margin on the intake and .080 or .090 on the exhaust ,leaving seat to tip length with a few .000" of each other . Dan
by 6.50camaro
Tue Mar 24, 2020 7:34 am
Forum: Engine Tech
Topic: ? steel shim gasket for sbc 400 ?
Replies: 32
Views: 1192

Re: ? steel shim gasket for sbc 400 ?

The picture is not correct . I have ordered and used these and they are steel shim . Why they have the wrong pic is beyond me. Dan
by 6.50camaro
Sun Mar 22, 2020 8:40 am
Forum: Engine Tech
Topic: ? steel shim gasket for sbc 400 ?
Replies: 32
Views: 1192

Re: ? steel shim gasket for sbc 400 ?

Speedway Motors has a 4.165 bore .024 steel shim gasket but no steam holes for $9.99 ea. . I have used these on 350'and 383 's with out problems . If you think you could do the holes might be worth the try. Dan
by 6.50camaro
Fri Mar 20, 2020 4:41 pm
Forum: Engine Tech
Topic: ? steel shim gasket for sbc 400 ?
Replies: 32
Views: 1192

Re: ? steel shim gasket for sbc 400 ?

Don't know if this will help? Ferrea used to have a composite hg that was 4.205 bore x.035 thick. Sealed good and really had to scrape to get the grafoil coating (or whatever it was) off the block and heads . Can't remember about steam holes though . They stop selling head gaskets but they probably ...
by 6.50camaro
Sat Feb 29, 2020 9:16 pm
Forum: Engine Tech
Topic: COMP cams retainer height
Replies: 15
Views: 732

Re: COMP cams retainer height

It is amusing to me how you can have 2 supposed std height 10° locks from 2 different companies be .030" or so different the the same valve and retainer
by 6.50camaro
Sat Feb 29, 2020 9:05 pm
Forum: Engine Tech
Topic: ARP head studs
Replies: 10
Views: 969

Re: ARP head studs

Are they bottoming out in the bolt holes? Have had to use a bottoming tap to get the threads run further down in the holes before. Also have bull nosed the end of the stud that screws into the block to get it to thread down into the block enough. Might want to contact the manufacturer and verify wh...
by 6.50camaro
Wed Feb 26, 2020 7:48 pm
Forum: Engine Tech
Topic: RPM Air Gap Runner Length (SBC)
Replies: 37
Views: 1849

Re: RPM Air Gap Runner Length (SBC)

Just read back thru my early post . Miss wrote 1.46 csa it should have been 2.46 sq.in. IMHO that is the "magic" of the rpm ag sized large enough to carry a health small block to 6500 rpms and small enough to get velocity up to make peak torque in the 4000-4500 range . Length has little to do with i...
by 6.50camaro
Mon Feb 24, 2020 12:46 pm
Forum: Engine Tech
Topic: RPM Air Gap Runner Length (SBC)
Replies: 37
Views: 1849

Re: RPM Air Gap Runner Length (SBC)

Can't really remember exact numbers ,forgot to right them down a few years ago and dont have the manifold any longer . But it was in the 5.5" to 6" range . Thats is measuring to where the two runners merge , not to under the carb . The avg. Cross section with the flange gasket matched to a 1205 was...
by 6.50camaro
Sun Feb 23, 2020 8:56 pm
Forum: Engine Tech
Topic: RPM Air Gap Runner Length (SBC)
Replies: 37
Views: 1849

Re: RPM Air Gap Runner Length (SBC)

Can't really remember exact numbers ,forgot to right them down a few years ago and dont have the manifold any longer . But it was in the 5.5" to 6" range . Thats is measuring to where the two runners merge , not to under the carb . The avg. Cross section with the flange gasket matched to a 1205 was ...
by 6.50camaro
Thu Feb 06, 2020 7:49 pm
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 5432

Re: Why does a tighter lsa need more compression?

IMHO, Cranes advising higher copmression is not a result of tighter centerline put of overall intake duration and later closing off intake . The tighter centerline is to keep the exhaust from opening to early because they always think you need more exhaust duration than intake . The degree of overla...
by 6.50camaro
Thu Jan 30, 2020 9:52 pm
Forum: Engine Tech
Topic: SBC Induction Length
Replies: 9
Views: 572

Re: SBC Induction Length

I just did a goggle search using that title and that thread on this site popped up right at the top of the list . Dan
by 6.50camaro
Thu Jan 30, 2020 9:39 pm
Forum: Engine Tech
Topic: SBC Induction Length
Replies: 9
Views: 572

Re: SBC Induction Length

Back on Nov.12, 2008 Larry Meaux of maxracesoftware posted a long list of sbc heads and many other popular heads of their intake and exhaust port centerline length . I have this thread bookmarked but can't for the life of me figure out how to link it on my kindle fire . The thread was titled " What ...
by 6.50camaro
Thu Jan 23, 2020 10:35 am
Forum: Engine Tech
Topic: Compression
Replies: 50
Views: 2273

Re: Compression

I come up with 15.01 to 1. if the volume at .300 in the hole is 70cc the valve notches are 4cc larger then the dome . 825.2 cc = volume of cyl at bdc +58.88 cc swept volume of chamber 46cc + h g volume 6.68cc + 2.2 cc piston .010 piston in hole +4cc valve notch 884.08 884.08 divided by 58.88=15.01 j...