Chevy Small Block Dyno Results - Bolt On A Cam And Heads And Add 120+HP

	Flow Test 1			Flow Test 2			Flow Test 3
Valve Lift	Int.	Exh.	E/I	Int.	Exh.	E/I	Int.	Exh.	E/I
0.100	65	52	80%	65	57	87%	65	63	97%
0.200	133	101	76%	141	109	77%	132	115	87%
0.300	189	134	71%	187	15	181%	193	164	85%
0.400	208	161	77%	227	175	77%	235	192	82%
0.500	219	175	80%	256	198	77%	267	209	78%
0.600	223	187	84%	252	211	84%	284	217	76%
			78% Avg.			80% Avg.			84% Avg.
All three heads were tested on a 3.78-inch test bore fixture.

325 Chevy Small Block Engine Exhaust Flow Test

Dyno Numbers
Test 1 was the baseline test for the stock 5.3L with a GM Performance Parts single-plane intake manifold, a Holley 750-cfm carburetor, and a set of Hooker 13/4-inch headers complete with a 21/2-inch exhaust system and Flowmaster Super 44 mufflers.

Test 2 was the same engine with the only addition being the Comp Thumper hydraulic roller camshaft.

325 Chevy Small Block Engine Dyno Run Test

Test 3 used the same configuration as Test 2 with the addition of West Coast Racing Cylinder Heads (WCRCH) mildly ported stock 5.3L heads.

Test 4 was the same as Test 3 with the change to a pair of WCRCH fully CNC-ported Edelbrock castings.

	TEST 1		TEST 2		TEST 3		TEST 4		DIFFERENCE
RPM	TQ	HP	TQ	HP	TQ	HP	TQ	HP	TQ	HP
1,600	310	94	273	84	287	88	282	87	- 28	- 7
1,800	320	110	289	101	302	105	300	104	- 20	- 6
2,000	325	124	291	111	304	115	303	115	- 22	- 9
2,200	327	137	290	120	303	125	302	125	- 25	- 12
2,400	328	150	292	132	304	138	303	137	- 25	- 13
2,600	329	163	299	147	311	154	309	153	- 20	- 10
2,800	330	176	310	166	322	172	319	171	- 11	- 5
3,000	332	190	324	186	335	193	332	190	0	0
3,200	335	204	338	207	349	213	345	211	+ 10	+ 7
3,400	339	219	351	228	360	233	356	230	+ 17	+ 11
3,600	343	235	360	246	367	251	364	248	+ 21	+ 13
3,800	347	251	365	263	371	267	368	265	+ 21	+ 14
4,000	349	266	367	279	372	282	370	280	+ 21	+ 14
4,200	351	281	368	293	372	297	371	296	+ 20	+ 15
4,400	351	294	368	308	372	312	372	312	+ 21	+ 18
4,600	350	306	369	324	374	329	375	329	+ 25	+ 23
4,800	347	317	371	340	379	348	379	348	+ 32	+ 31
5,000	342	326	375	358	384	367	385	368	+ 43	+ 42
5,200	335	332	378	375	390	386	391	387	+ 56	+ 55
5,400	327	336	381	391	393	403	395	405	+ 68	+ 69
5,600	316	337	381	405	393	417	396	420	+ 80	+ 83
5,800	304	336	377	415	388	428	392	432	+ 88	+ 96
6,000	290	332	369	422	380	435	385	441	+ 95	+109
6,200	276	326	360	426	370	439	377	447	+101	+121
6,400	-	-	351	429	362	443	370	452	-	-
6,600	-	-	344	432	357	447	365	457	-	-
6,800	-	-	336	433	349	449	357	460	-	-
	TQ*	HP*	TQ	HP	TQ	HP	TQ	HP
Avg.	328.6	242.7	342.6	281.8	352.8	289.8	353.2	291.2
Averages for Tests 2 through 4 were from 1,500 to 6,900 rpm, while Test 1 averages were only for 1,500 through 6,300, so these numbers are lower.